www.wolterskluwer.com/en/expert-insights/whole-ball-of-tax-elective-pass-through-entity-tax
See also:
www.fticonsulting.com/insights/articles/guide-new-schedule-k-2-k-3-pass-through-entities
www.gmlaw.com/news/state-income-tax-considerations-for-pass-through-entities-what-business-owners-need-to-know/